Beam compass



K. AKASHI BEAM COMPASS March 1,1927. 1,619,392

Filed Julyl6, 1923 lNVE/VTO R.

Patented Mar. 1, 1927.

UNITED STATES KAZUZE AKASI-TI, OF TOKYO, JAPAN.

BEAM COMPASS.

' Application filed July 16,

This invention has reference generally to improvements in drafting instruments and more particularly relates to an improved beam compass.

It is the primary aim and object of the present invention to provide a beam of improved construction and novel means for adjustably mounting the marking element thereon.

More particularly the invention embraces the provision of a beam compass of the character described embodying a slotted beam element for slidably accommodating a part to which is afixed the marking element and in which is housed the means for adjusting the part and the marking element so that the latter may be positioned in any desired point on the beam.

Other objects as well as the nature, char-. acteristic features and scope of the invention will be more readily apparent from the fol lowing description taken in connection with the accompanying drawings and pointed out in the claim forming a part of this specification. 1

The invention is clearly illustrated in the accompanying drawings, in which Fig. 1 is a side elevation of the compass showing the adjustable marking element,

Fig. 2 is a section on line 2-2 of Fig. 1,

Fig. 3 is a section on the line 33 of Fig. 1,

Fig. 4: is an enlarged elevational detail of the marking element including its support and adjusting means, and

Fig. 5 is a top plan view thereof.

Referring now, more particularly, to the accompanying drawings there is provided a hollow beam 1, one lateral face of which in turn is provided with a longitudinal slot 1 while mounted within the tube for longitudinal sliding movement is a sliding piece 2. This sliding piece is provided with a transverse slot 2 positioned in alignment with the slot 1 in the beam 1. In order that the sliding piece may be effectively adjusted suitable fastening elements 3 have their inner ends anchored therein and are positioned transversely thereof so as to extend laterally therefrom and through the slot 1. These fasteners also act to secure a two-part support 4'to the sliding piece 2. The parts of the support 4 are formed with a bearing medially of the ends in which is mounted the stub axle 5 of an adjusting 1923. Serial N0.-651,982.

roller 6, the latter having a portion positioned within the slot 2 and in engagement with the inner surface of the hollow beam while a portion also projects through a slot in one part of the support a so as to be positioned laterally of the beam, the outer edge of the roller or wheel being knurled to facilitate adjustment by the thumb or finger of the user and this roughened surface likewise effectively frictionally engages the inner surface of the beam to facilitate the sliding of the sliding piece upon the turning of the roller.

A marking element 7 is carried by the two-part support and in the present instance is in the form of a pen the blades of which are carried by the support 4 If it is desired the beam may be formed in sections and the section 8 may be adjusted wlth respect to the section 1 by means of a suitable connecting piece 9 and which is receivable within the adjacent ends of the hollow beam sections and fastened thereto by suitable clamping elements 10 which are positioned through the slots and act to clamp the beam sections into frictional engagement with the connecting piece as apparent. Either the beam 1 or the section 8 may be fitted with a fixing pin not shown so that the compass may be used in the usual manner. 7

It is believed in view of the foregoing that a further detailed description of the operation of the invention is unnecessary. Likewise it is believed that the advantages of the invention will be readily apparent.

I claim:

In a compass of the character described, a hollow metallic beam provided with a longitudinal slot along one side face, a sliding piece adjustable within the beam and provided with a slot aligning with the slot in the beam, a support outside the beam, means whereby the support is fixed'to the sliding piece, a shaft mounted in the support, an adjusting roller mounted on the shaft and arranged through the slots and in intimate contact with the inner surface of the beam opposite the slot so that upon rotation of the roller the sliding piece will be adjusted and a marking element connected with the sliding piece.

In testimony whereof he aflixes his signature.

KAZUE AKASHI. 

